Production of dyed or undyed wool with an antifelting finish: quaternized piperazine condensate

Abstract

Undyed or dyed wool with an antifelting finish is produced by a method in which the wool is chlorinated at a pH of less than 4 and then an aqueous solution of a quaternary product is applied onto the wool, this product being obtained by condensation of (a) piperazine and piperazine derivatives with (b) crosslinking agents, such as epichlorohydrin and ethylene chloride, in a molar ratio of from 1:0.9 to 1:1, and quaternization of the condensate with benzyl chloride, for 0.15 to 1.0 mole of benzyl chloride being employed per equivalent of nitrogen in component (a) in the quaternization. To produce dyed wool with an antifelting finish, dyeing is carried out after the wool has been chlorinated.

We claim: 
     
       1. A process for the production of undyed wool with an antifelting finish, by chlorinating the wool at a pH of less than 4, and applying onto the wool an aqueous solution of a cationic quaternary condensate which is obtained by condensation of (a) piperazine, bis-(1,4-aminopropyl)-piperazine, 1-aminoethylpiperazine, 2-hydroxyethylpiperazine, bisbenzylpiperazine or 1-methylpiperazine, or a mixture of these, with   (b) ethylene chloride, an epihalohydrin, propylene chloride, 1,3-dichloro-2-hydroxypropane, bis-epoxybutane or 1,4-dichlorobutane, or a mixture of these, in a molar ratio of from 1:0.5 to 1:1.1, and quaternization of the condensate with benzyl chloride, from 0.15 to 1.0 mole of benzyl chloride being employed per equivalent of nitrogen in component (a) in the quaternization.   
     
     
       2. The process as claimed in claim 1, wherein from 0.5 to 3% by weight, based on dry wool, of the quaternary product is applied. 
     
     
       3. The process as claimed in claim 1, wherein the pH of the aqueous solution of the quaternary product is from 4 to 10. 
     
     
       4. The process as claimed in claim 1, wherein the pH of the aqueous solution of the quaternary product is from 7 to 8. 
     
     
       5. A process for the production of dyed wool with an antifelting finish, by chlorinating the wool at a pH of less than 4, dyeing the chlorinated wool and applying onto the wool an aqueous solution of a cationic quaternary condensate which is obtained by condensation of (a) piperazine, bis-(1,4-aminopropyl)-piperazine, 1-aminoethylpiperazine, 2-hydroxyethylpiperazine, bisbenzylpiperazine or 1-methylpiperazine or a mixture of these, with   (b) ethylene chloride, an epihalohydrin, propylene chloride, 1,3-dichloro-2-hydroxypropane, bis-epoxybutane or 1,4-dichlorobutane, or a mixture of these, in a molar ratio of from 1:0.5 to 1:1.1, and quaternization of the condensate with benzyl chloride, from 0.15 to 1.0 mole of benzyl chloride being employed per equivalent of nitrogen in component (a) in the quaternization.     
     
     
       6. The process as claimed in claim 5, wherein from 0.5 to 3% by weight, based on dry wool, of the quaternary product is applied. 
     
     
       7. The process as claimed in claim 5, wherein a wool which has been chlorinated at a pH of from 0.5 to 3 and dyed with a metal complex dye is treated with from 0.7 to 1.5% by weight of the quaternary product. 
     
     
       8. The process as claimed in claim 5, wherein the pH of the aqueous solution of the quaternary product is from 4 to 10. 
     
     
       9. The process as claimed in claim 5, wherein the pH of the aqueous solution of the quaternary product is from 7 to 8. 
     
     
       10. The process as claimed in claim 5, wherein a wool which has been chlorinated at a pH of from 0.5 to 3 and dyed with a metal complex dye is treated with from 0.7 to 1.5% by weight of the quaternary product.